<template>
  <view>
    <view class="search-box">
      <uni-search-bar
        @input="input"
        :radius="100"
        cancelButton="none"
        focus
      ></uni-search-bar>
    </view>

    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view
        class="sugg-item"
        v-for="(item, i) in searchResults"
        :key="i"
        @click="gotoDetail(item)"
      >
        <view class="goods-name">{{ item.goods_name }}</view>
        <uni-icons type="right" size="16"></uni-icons>
      </view>
    </view>

    <!-- 搜索历史区域 -->
    <view class="history-box" v-else>
      <!-- 搜索标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="18" @click="clean"></uni-icons>
      </view>
      <view class="history-list">
        <uni-tag
          class="history-tag"
          :text="item"
          v-for="(item, i) in histories"
          :key="i"
          inverted
          @click="gotoGoodsList(item)"
        ></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      timer: null,
      // 搜索关键词
      kw: '',
      // 搜索结果列表
      searchResults: [],
      // 搜索历史的数组
      historyList: ['a', 'app', 'apple']
    }
  },
  onLoad() {
    this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
  },
  methods: {
    // input 输入事件
    input(e) {
      clearTimeout(this.timer)
      this.timer = setTimeout(() => {
        this.kw = e
        this.getSearchList()
      }, 500)
    },
    async getSearchList() {
      // 判断搜索关键词是否为空
      if (this.kw.trim().length === 0) {
        this.searchResults = []
        return
      }

      const { data: res } = await uni.$http.get('/goods/search', { query: this.kw })

      if (res.meta.status !== 200) return uni.$showMsg()
      this.searchResults = res.message.goods

      this.saveSearchHistory()
    },
    gotoDetail(item) {
      uni.navigateTo({
        url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
      })
    },
    // 保存搜索历史记录
    saveSearchHistory() {
      // this.historyList.push(this.kw)

      const set = new Set(this.historyList)

      set.delete(this.kw)
      set.add(this.kw)

      this.historyList = Array.from(set)

      // 将搜索的历史数据，进行历史化的存储
      uni.setStorageSync('kw', JSON.stringify(this.historyList))
    },
    // 清空历史记录
    clean() {
      this.historyList = []
      uni.setStorageSync('kw', '')
    },
    gotoGoodsList(kw) {
      uni.navigateTo({
        url: '/subpkg/goods_list/goods_list?query=' + kw
      })
    }
  },
  computed: {
    histories() {
      return [...this.historyList].reverse()
    }
  }
}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list {
  .sugg-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 5px;
    border: 1px solid #efefef;

    .goods-name {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
}

.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    height: 40px;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .history-tag {
      margin: 5px;
    }

    .uni-tag--default--inverted {
      font-weight: 550;
      font-size: 13px;
      border: none;
      background-color: #f5f5f5;
      color: #000;
    }
  }
}
</style>
